DEBT AND CREDIT FACILITIES - NOTES ISSUED IN LONG-TERM DEBT OFFERINGS (Details) - Sempra Energy [Member] - USD ($) $ in Millions	Jan. 12, 2018	Dec. 31, 2018
Floating Rate Notes Due Twenty Nineteen [Member]
Debt Instrument [Line Items]
Debt amount	$ 500
Floating Rate Notes Due Twenty Nineteen [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable percentage rate	0.25%
Floating Rate Notes Due Twenty Twenty One [Member]
Debt Instrument [Line Items]
Debt amount	$ 700
Floating Rate Notes Due Twenty Twenty One [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Variable percentage rate	0.50%
Two Point Four Percent Notes Due Twenty Twenty [Member]
Debt Instrument [Line Items]
Stated percentage rate		2.40%
Debt amount	$ 500
Two Point Nine Percent Notes Due Twenty Twenty Three [Member]
Debt Instrument [Line Items]
Stated percentage rate		2.90%
Debt amount	500
Three Point Four Percent Notes Due Twenty Twenty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate		3.40%
Debt amount	1,000
Three Point Eight Percent Notes Due Twenty Twenty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate		3.80%
Debt amount	1,000
Four Percent Notes Due Twenty Forty Eight [Member]
Debt Instrument [Line Items]
Stated percentage rate		4.00%
Debt amount	$ 800